fix PR3537: if resetting bbi back to the start of a block, we need to
forget about already inserted expressions.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64362 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/X86/2009-02-11-codegenprepare-reuse.ll b/test/CodeGen/X86/2009-02-11-codegenprepare-reuse.ll
new file mode 100644
index 0000000..7b73a86
--- /dev/null
+++ b/test/CodeGen/X86/2009-02-11-codegenprepare-reuse.ll
@@ -0,0 +1,35 @@
+; RUN: llvm-as < %s | llc
+; PR3537
+target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
+target triple = "i386-apple-darwin9.6"
+ %struct.GetBitContext = type <{ i8*, i8*, i32, i32 }>
+
+define i32 @alac_decode_frame() nounwind {
+entry:
+ %tmp2 = load i8** null ; <i8*> [#uses=2]
+ %tmp34 = getelementptr i8* %tmp2, i32 4 ; <i8*> [#uses=2]
+ %tmp5.i424 = bitcast i8* %tmp34 to i8** ; <i8**> [#uses=2]
+ %tmp15.i = getelementptr i8* %tmp2, i32 12 ; <i8*> [#uses=1]
+ %0 = bitcast i8* %tmp15.i to i32* ; <i32*> [#uses=1]
+ br i1 false, label %if.then43, label %if.end47
+
+if.then43: ; preds = %entry
+ ret i32 0
+
+if.end47: ; preds = %entry
+ %tmp5.i590 = load i8** %tmp5.i424 ; <i8*> [#uses=0]
+ store i32 19, i32* %0
+ %tmp6.i569 = load i8** %tmp5.i424 ; <i8*> [#uses=0]
+ %1 = call i32 asm "bswap $0", "=r,0,~{dirflag},~{fpsr},~{flags}"(i32 0) nounwind ; <i32> [#uses=0]
+ br i1 false, label %bb.nph, label %if.then63
+
+if.then63: ; preds = %if.end47
+ unreachable
+
+bb.nph: ; preds = %if.end47
+ %2 = bitcast i8* %tmp34 to %struct.GetBitContext* ; <%struct.GetBitContext*> [#uses=1]
+ %call9.i = call fastcc i32 @decode_scalar(%struct.GetBitContext* %2, i32 0, i32 0, i32 0) nounwind ; <i32> [#uses=0]
+ unreachable
+}
+
+declare fastcc i32 @decode_scalar(%struct.GetBitContext* nocapture, i32, i32, i32) nounwind